File:The geological observer (IA geoloobserve00delarich).pdf
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![File:The geological observer (IA geoloobserve00delarich).pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/7/7b/The_geological_observer_%28IA_geoloobserve00delarich%29.pdf/page1-388px-The_geological_observer_%28IA_geoloobserve00delarich%29.pdf.jpg?20201022072729)
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